Player : What kind of RPG are you wanting to run ?
GM: That's none of your business.
I just don't understand how that approach is helpful ?
What do you get from it ?
I aren't talking about keeping mystery within the game while you are playing, but why cant you share basic ideas on how you are going to run a game before a player decides if he wants to play ?
Why do you think a player has no business knowing what kind of game they are signing up for ?